Regarding Some Things the Reader Likely Knows About Clayton Kershaw
In terms of Clayton Kershaw, the reader is likely aware that (a) he was the Cy Young of the National League last year, that (b) he was also among the National League leaders in pitcher WAR, and that (c) both his fastball and slider are among the best pitches in the majors.

Regarding a Thing the Reader Might Not Know About Clayton Kershaw
The reader might not know that Clayton Kershaw is one of only five pitchers (along with R.A. Dickey, Stephen Strasburg, Cole Hamels, and Jeff Samardzija) who currently possess a perfect 10 according to NERD — i.e. the made-up stat that, according to the present author, measures the likely aesthetic appeal (or, watchability) of a player or team or whatever.

Regarding to What Degree You Should Trust Said Author
Probably not that much, actually.

Pittsburgh at St. Louis | 20:15 ET
The Cardinals entered play on Tuesday with the league’s second-highest team wRC+ and top batter/fielder WAR and then posted a single-game wOBA of .446 en route to scoring 10 runs against the Pirates last night (box). Lance Lynn starts for St. Louis and has apparently been excellent. Line: 27.0 IP, 24.7% K, 6.2% BB, 52.2% GB, 2.96 SIERA, 84 xFIP-, 0.5 WAR.